General Motors make a performance stainless steel cat back exhaust system for the Pontiac GTP (1997-2002). It has 2.5 inch diameter pipes and 4 inch diameter stainless steel exhaust tips. You will have to give up the original oval cast aluminum tips for this package. The system provides higher flow and a nice "throaty" sound. The part number for the package is 12498617. At the end of the day, you have to make a compromise between a performance and sound. This system creates a nice balance, but it is louder than stock.
The stock will sound best and provide the best performance. Cans close trails.
It should be 2 in
performance exhausts are always better for vehicles. Along with an increase in horsepower and torque, you will also get an increase in mpg(miles per gallon)
if you have an 3.1 it dont sound bad, it sounds like an v8 at idle, but not as loud
I believe on the grand prix's form 97-03 it's 2.5" I own an 02 gtp.
In business and the stock market, you abbreviate the word performance as PERF. In the stock market, performance refers to how a stock is doing.
dont put an exhaust on a v6 it sounds fine stock if you wanted it to sound good you should have gotten the v8
The stock exhaust diameter is 2 inches
That term refers to the portion of the exhaust from the catalytic converter on back to where it ends at the rear of the vehicle. They generally use larger pipe than the stock system. Good systems will have mandrel-bent turns that allow the exhaust gas pass with as little back pressure as possible. The mufflers in these kits are often glasspacks to reduce back pressure. It is more of a improvement in sound than performance, it will help achieve a deeper sound that is lacking in small displacement engines and improves horsepower very little. An improvement is there but hardly worth the cost as a performance upgrade.
It will make the exhaust come out those holes instead of the the tail pipe. Just take your vehicle to a muffler shop and have them remove your muffler and put pipe in it's place. No restriction means more flow which means higher performance, unless your talking about a 2-stroke then don't f with it.
If you get it from a performance website (zzp,wbody,etc.) then yes it will. the flanges sizes are the same if you get the offroad. If you get the shorty, you will need a reducer.